CN210669836U

CN210669836U - Linear vibration motor with iron core nested in coil

Info

Publication number: CN210669836U
Application number: CN201921408282.3U
Authority: CN
Inventors: 郭少千; 林岳崇; 王磊
Original assignee: Lingxian Technology Dongtai Co ltd
Current assignee: Lingxian Technology Dongtai Co ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-06-02
Anticipated expiration: 2029-08-28

Abstract

The utility model discloses a linear vibrating motor of nested iron core in coil, including the casing, be provided with the active cell subassembly in the casing and with the corresponding complex stator module of active cell subassembly, stator module includes the coil and is used for the FPC board that coil and external circuit are connected, the nested iron core that has in the coil, the active cell subassembly have with the corresponding complex permanent magnet of coil. The utility model discloses can increase the magnetic conductivity of whole magnetic circuit, improve the magnetic induction intensity that the coil receives, be convenient for the permanent magnet and carry out the interact with the coil better, the magnetic circuit of product has been improved, the energy utilization and the vibrational force of product have been improved, effectively increase the BL value of product, vibration effect is good, and production, convenience such as assembly, simple structure, compactness, stability, occupation space is little, the stability of product has been improved, poor reliability and processing procedure yield, the product of being convenient for carries out the volume production, the application and the development of product have been enlarged.

Description

Linear vibration motor with iron core nested in coil

Technical Field

The utility model relates to the technical field of motors, especially, relate to a linear vibrating motor of nested iron core in coil.

Background

With the rapid development of electronic products, especially mobile terminal devices such as mobile phones and tablet computers, these electronic devices basically use a vibration generating device for preventing noise from the electronic device from interfering with others. The traditional vibration generating device adopts a rotor motor based on eccentric rotation, and realizes mechanical vibration through the rotation of an eccentric vibrator, because the eccentric vibrator generates mechanical friction, electric sparks and the like in the rotating process, a commutator and an electric brush can influence the rotating speed of the eccentric vibrator, and further the vibration effect of the device is influenced, therefore, the vibration generating device adopts a linear motor with better performance.

Linear motors, also called linear motors, push rod motors, etc., the most commonly used types of linear motors are flat plate type, U-shaped slot type, and tube type, which are technologies for converting electric energy into linear motion mechanical energy, and suspend a moving element by repulsive force of a magnet, and directly drive the moving element by magnetic force, without transmission via a transmission mechanism such as a gear set, as in a rotary motor, so that the linear motor can make the moving element driven by the linear motor perform reciprocating motion of high acceleration and deceleration, and by this characteristic, the linear motor can be applied to various manufacturing and processing technical fields, and used as a driving power source or as a technical content for providing positioning. In addition, with the rapid development and strong competition of industries such as semiconductor, electronic, photoelectric, medical equipment and automation control, the requirement for linear motion performance of motors in various fields is increasing, and the motors are expected to have high speed, low noise and high positioning accuracy, so that linear motors are used in many applications to replace mechanical motion methods such as conventional servo motors.

However, some existing linear motors have certain defects in design, so that the problems of small vibration force, large occupied space, poor stability and reliability and the like are caused, the vibration effect of the motor is reduced, and the application and development of the linear motor are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that above-mentioned current linear motor exists, provide a linear vibrating motor of nested iron core in coil.

In order to solve at least one of the above technical problems, the utility model provides a following technical scheme:

the linear vibration motor comprises a shell, wherein a rotor assembly and a stator assembly correspondingly matched with the rotor assembly are arranged in the shell, the stator assembly comprises a coil and an FPC (flexible printed circuit) board used for connecting the coil with an external circuit, the iron core is embedded in the coil, and the rotor assembly is provided with a permanent magnet correspondingly matched with the coil.

The utility model has the advantages that: the coil of the inner nested iron core is in a magnetic field generated by a permanent magnet of the rotor assembly, after the coil is powered on by an external circuit through the FPC board, the coil interacts with the permanent magnet, so that the rotor assembly vibrates in the vertical direction relative to the stator assembly, the iron core is nested in the coil, the magnetic conductivity of the whole magnetic circuit can be increased, the magnetic induction strength of the coil is improved, the permanent magnet and the coil can better interact conveniently, the magnetic circuit of a product is improved, the energy utilization rate and the vibration force of the product are improved, the BL value of the product is effectively increased, the vibration effect is good, the production, the assembly and the like are convenient, the structure is simple, compact and stable, the occupied space is small, the stability of the product is improved, the reliability is poor, the process yield is high, the product can be produced in quantity.

In some embodiments, the core has a hollow cylindrical shape, the permanent magnet has a diameter smaller than an inner diameter of the core and one end thereof is located in the core, and the permanent magnet is capable of moving in an axial direction of the core to vibrate the moving member assembly.

In some embodiments, one end of the permanent magnet near the coil is provided with a pole piece.

In some embodiments, the casing includes an upper casing and a lower casing, and the stator assembly is disposed on the lower casing.

In some embodiments, a third groove for installing the FPC board is provided on the lower housing.

In some embodiments, the bottom surface of the third tank body is provided with a positioning through hole.

In some embodiments, the mover assembly is elastically coupled to the upper and lower cases by springs, respectively.

In some embodiments, the lower housing has a first flange formed thereon for engaging the spring and the upper housing.

In some embodiments, the mover assembly includes a mass coupled to the spring, and the permanent magnet is disposed at an end of the mass adjacent to the coil.

In some embodiments, one end of the mass block, which is close to the coil, is provided with a magnetic yoke which is matched with the permanent magnet and a first hole body for arranging the magnetic yoke, and the magnetic yoke is provided with a fourth groove body which is used for arranging the permanent magnet and has a notch facing the coil.

In addition, in the technical solutions of the present invention, the technical solutions can be implemented by adopting conventional means in the art, which are not specifically described.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an exploded view of a linear vibration motor with a core nested inside a coil according to an embodiment of the present invention.

Fig. 2 is a perspective view of a linear vibration motor with an iron core nested in a coil according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a linear vibration motor with cores nested in coils according to an embodiment of the present invention.

Fig. 4 is a perspective view of an upper housing according to an embodiment of the present invention.

Fig. 5 is a perspective view of a lower housing according to an embodiment of the present invention.

Fig. 6 is a perspective view of an iron core according to an embodiment of the present invention.

The reference numerals in the drawings indicate that the casing 1, the upper casing 11, the insertion portion 111, the pressing surface 112, the seventh slot 113, the lower casing 12, the first flange 121, the first slot 122, the third slot 123, the positioning through hole 124, the sixth slot 125, the first notch 126, the support portion 127, the mover assembly 2, the permanent magnet 21, the mass block 22, the first hole 221, the fifth slot 222, the yoke 23, the fourth slot 231, the second flange 232, the pole piece 24, the stator assembly 3, the coil 31, the iron core 32, the FPC board 33, the connecting portion 331, the spring 4, and the second slot 41.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of but not limiting of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "upper," "lower," "primary," "secondary," and the like are used for descriptive purposes only and may be used for purposes of simplicity in more clearly distinguishing between various components and not to indicate or imply relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is the embodiment of the utility model provides a linear vibrating motor's of nested iron core in coil exploded view, fig. 2 is the utility model discloses a linear vibrating motor's of nested iron core in coil stereogram, fig. 3 is the utility model provides a section view of linear vibrating motor of nested iron core in coil, fig. 4 is the utility model discloses a stereogram of last casing that provides, fig. 5 is the utility model discloses the stereogram of lower casing that the embodiment provides, fig. 6 is the utility model provides a stereogram of iron core.

Example (b):

as shown in fig. 1 to 6, a linear vibration motor with an iron core embedded in a coil includes a casing 1, a mover assembly 2 and a stator assembly 3 correspondingly matched with the mover assembly 2 are disposed in the casing 1, the mover assembly 2 is generally located above the stator assembly 3, the casing 1 includes an upper casing 11 and a lower casing 12, the stator assembly 3 is disposed on the lower casing 12, and the upper casing 11 and the lower casing 12 are generally welded together. The stator assembly 3 includes a coil 31, an iron core 32 is nested in the coil 31, the coil 31 and the iron core 32 are usually fixed by gluing, the coil 31 is connected with an external circuit through an FPC board 33, the coil 31 and the FPC board 33 are usually connected by gluing or welding, the FPC board 33 and/or the coil 31 are usually fixed by gluing on the lower case 12, the mover assembly 2 has a permanent magnet 21 correspondingly matched with the coil 31, the permanent magnet 21 is usually located above the coil 31, and the coil 31 interacts with the permanent magnet 21 after being electrified to enable the mover assembly 2 to vibrate in a vertical direction. The coil 31 and the iron core 32 are generally hollow cylindrical, and may be in other suitable shapes, the iron core 32 may also be solid, the iron core 32 is generally made of stainless steel, silicon steel and other materials with good magnetic conductivity, the iron core 32 not only can improve the structural stability of the coil 31 and the reliability of connection between the coil 31 and relevant parts, and is convenient for production, assembly and the like, but also the iron core 32 can better conduct surrounding magnetic induction lines to the coil 31, so that the magnetic conductivity of the whole magnetic circuit can be increased, the magnetic induction intensity borne by the coil 31 is improved, the magnetic field generated by the permanent magnet 21 can better act on the coil 31, and the interaction force between the permanent magnet 21 and the coil 31, namely the vibration force of the product, is improved.

The FPC board 33 is a Flexible Printed Circuit board (Flexible Printed Circuit), which is a Printed Circuit board having high reliability and excellent flexibility, made of polyimide or polyester film as a base material, and has the characteristics of high wiring density, light weight, thin thickness, and good bendability; the permanent magnet 21 is a magnet capable of retaining high remanence for a long time in an open circuit state, and is also called a hard magnet, such as a magnetic steel, a neodymium magnet, a permanent magnet made of a ferrite permanent magnet material, and the like, preferably the magnetic steel, the magnetic steel has the characteristics of high hardness, high coercive force value, high temperature resistance, strong corrosion resistance, and the like, has good permanent magnet characteristics, and can retain strong and stable magnetism for a long time after an external magnetic field is removed after being magnetized in a saturated state.

In use, the coil 31 of the inner nested iron core 32 is in a magnetic field generated by the permanent magnet 21 of the mover assembly 2, after the coil 31 is energized by an external circuit through the FPC board 33, the coil 31 is subjected to a certain ampere force, the coil 31 and the permanent magnet 21 interact, and since the coil 31 is fixed, the permanent magnet 21 moves relative to the coil 31 under a corresponding reaction force, so that the coil 31 also cuts magnetic induction lines, so that the mover assembly 2 vibrates vertically relative to the stator assembly 3, that is, the product vibrates. The utility model discloses an embedded iron core 32 in coil 31, not only can increase the magnetic conductivity of whole magnetic circuit, improve the magnetic induction that coil 31 received, be convenient for permanent magnet 21 and coil 31 interact better, the magnetic circuit of product has been improved, the energy utilization and the vibrational force of product have been improved, the BL value of product is effectively increased, vibration effect is good, and production, convenience such as assembly, moreover, the steam generator is simple in structure, and is compact, and stable, and occupation space is little, the stability of product has been improved, poor reliability and processing procedure yield, the product of being convenient for carries out the volume production, the application and the development of product have been enlarged. In addition, BL value is the product of magnetic field intensity and the effective cutting length of coil promptly, BL value reflection is the size of different motors ampere force under the same electric current, BL value is big ampere force big more, the frequency and the range that can change 2 vibrations of active cell subassembly through the current waveform of adjusting coil 31 to can produce different feelings of shaking, the sense of shaking is abundant, realize multiple different tactile feedback, be convenient for be applied to smart machine tactile feedback's power supply, the range of application of product has been improved.

The pole piece 24 is arranged at one end of the permanent magnet 21 close to the coil 31, the pole piece 24 can be generally glued or welded on the permanent magnet 21, the pole piece 24 is generally made of a soft magnetic material which does not produce a magnetic field and only plays a role in magnetic induction line transmission in a magnetic circuit, the pole piece 24 can restrict the magnetic field generated by the permanent magnet 21 to a certain extent, so that the magnetic induction lines can better act on the coil 31, the induction adding efficiency is improved, the utilization efficiency of the magnetic induction lines, namely the utilization efficiency of energy, and further the interaction force of the permanent magnet 21 and the coil 31, namely the vibration force of a product is improved.

In order to more conveniently and stably mount the FPC board 33, the lower chassis 12 is provided with a third groove 123 for mounting the FPC board 33, and the FPC board 33 is usually adhesively fixed on the bottom surface of the third groove 123. Further, in the assembly process of the product, the lower case 12 needs to be positioned at a certain fixture first, and then other parts are assembled, the bottom surface of the third groove 123 is further provided with a positioning through hole 124, the FPC board 33 is usually further provided with an avoiding through hole corresponding to and matched with the iron core 32, the coil 31 and the iron core 32 are usually hollow cylinders, an inner hole of the iron core 32 corresponds to the positioning through hole 124 so as to be positioned synchronously or form avoiding in the positioning process, the positioning of the lower case 12 and the assembly of related parts are facilitated through the positioning through hole 124, the operation is simple and convenient, the precision is higher, the stability is better, and the process yield of the product is improved.

The bottom surface of the third groove 123 may further be provided with a plurality of sixth grooves 125 matching with the FPC board 33, and the plurality of sixth grooves 125 are usually interlaced to form a net, so that the FPC board 33 can be more firmly adhered to the lower housing 12 after the glue is applied.

The FPC board 33 generally has a connection portion 331 protruding outside the housing 1 to facilitate connection with an external circuit, the lower housing 12 is provided with a first notch 126 for the connection portion 331 to pass through and a support portion 127 engaged with the connection portion 331, and the upper housing 11 is provided with a seventh groove 113 for the support portion 127 and the connection portion 331 to pass through, so that the motor is easily connected with the external circuit, and the structure is more compact and stable. The FPC board 33 can be further provided with a groove body matched with the lead of the coil 31, so that the structure is more compact, the occupied space of related parts is reduced, the lead of the coil 31 is protected, and the device is safer and more reliable.

The mover assembly 2 is elastically connected with the upper casing 11 and the lower casing 12 through the spring 4, that is, the spring 4 suspends the mover assembly 2 in the casing 1, usually, the lower end of the upper casing 11, the outer edge of the spring 4 and the lower end of the lower casing 12 are sequentially pressed and connected, and in the vibration process of the mover assembly 2, the spring 4 not only has the function of buffering protection, but also can provide a certain restoring force for the vibration of the mover assembly 2. The spring 4 can be a conical spring, a tower-shaped spring, a planar spring or other suitable elastic pieces, the planar spring generally refers to a spring piece which is vertically and elastically deformed in a plane, for example, an elastic material is formed by rolling on the plane, hollowed out on the planar elastic material or formed by punching and shearing the elastic material, and the like, the planar spring has a more compact structure, and the volume of a product can be reduced.

The lower casing 12 is formed with a first flange 121 which is matched with the spring 4 and the upper casing 11, and the upper casing 11 and/or the spring 4 is pressed against and connected to the first flange 121, so that the operation is more convenient, and the structure is more stable and firm.

The first flange edge 121 is provided with a plurality of first grooves 122, the first grooves 122 are generally located on the outer side edge of the first flange edge 121 and are uniformly distributed along the circumferential direction of the first flange edge 121, according to specific conditions, the number of the first grooves 122 is one, two or more, the spring 4 is provided with a second groove 41 correspondingly matched with the first groove 122, the second groove 41 is generally located on the outer side edge of the spring 4, the upper shell 11 is provided with an inserting portion 111 corresponding to the first groove 122 and the second groove 41, and during assembly, the inserting portion 111 is inserted into the first groove 122 and the second groove 41, so that the upper shell 11, the spring 4 and the lower shell 12 are connected more tightly, the structure is more compact, and the structure is more stable and reliable. Further, the thickness of the inserting portion 111 is smaller than that of the upper housing 11, so that an abutting surface 112 is formed at the intersection of the inserting portion 111 and the upper housing 11, and the upper housing 11 can be better matched with the spring 4 or the first flange edge 121 through the abutting surface 112, so that the stability is better.

The rotor assembly 2 comprises a mass block 22 connected with a spring 4, the mass block 22 is also called a balance block, a vibrating block, a balance weight block and the like, in the vibrating process, the mass block 22 can improve the vibrating force and the vibrating effect of the rotor assembly 2 through self inertia, so that the rotor assembly 2 can vibrate more stably and reliably, the permanent magnet 21 is arranged at one end, close to the coil 31, of the mass block 22, and the permanent magnet 21 and the mass block 22 can be connected in a gluing or welding mode.

One end of the mass 22 close to the coil 31 is provided with a yoke 23 matching with the permanent magnet 21 and a first slot 221 for mounting the yoke 23, the yoke 23 is provided with a fourth slot 231 for mounting the permanent magnet 21 with a notch facing the coil 31, the yoke 23 is mounted in the first slot 221 and the permanent magnet 21 is mounted in the fourth slot 231, the connection is tighter and firmer, the structure is more compact and stable, the magnetic yoke 23 usually refers to a soft magnetic material which does not produce a magnetic field (magnetic induction line) per se and only plays a role in magnetic induction line transmission in a magnetic circuit, the magnetic yoke 23 can be usually made of soft iron with higher magnetic permeability, A3 steel, soft magnetic alloy, ferrite material, stainless steel or silicon steel and the like, the magnetic yoke is uniformly and symmetrically arranged around the induction coil in a split manner, the magnetic yoke plays a role in restraining the outward diffusion of the magnetic leakage of the induction coil and improving the induction adding efficiency, and therefore the utilization efficiency of the magnetic induction line, namely the utilization efficiency of energy is improved.

The notch of the fourth groove 231 is further provided with a second flange 232, and one end of the first hole 221 is provided with a fifth groove 222 matched with the second flange 232, so that the connection is tighter, the structure is more compact, and the connection is more stable and reliable. In addition, the spring 4 can be connected to the mass 22 and the second flange 232, respectively, so that the connection is more compact and secure.

The iron core 32 is a hollow column, the diameter of the permanent magnet 21 is smaller than the inner diameter of the iron core 32, and one end of the permanent magnet is positioned in the iron core 32, when the permanent magnet is used, the permanent magnet 21 can move along the axial direction of the iron core 32 to enable the moving component 2 to vibrate, so that the structure is more compact and stable, and the structure is safer and more reliable. Further, the diameter of the fourth slot 231 is greater than the outer diameter of the coil 31, the diameter of the pole piece 24 is equal to that of the permanent magnet 21 or slightly smaller than that of the permanent magnet 21, the upper end of the coil 31 can be located in the fourth slot 231, the lower ends of the pole piece 24 and the permanent magnet 21 can be located in the iron core 32, the iron core 32 and the permanent magnet 21 are coaxial, the pole piece 24 and the permanent magnet 21 axially move along the iron core 32, so that the moving component 2 vibrates along the vertical direction, the utilization efficiency of the magnetic induction lines is higher, the utilization efficiency of energy is improved, the vibration effect is better, the structure is more compact and stable, and the size of a product is further reduced.

Under the same conditions, the relevant external interference factors are discharged, and the vibration force (i.e. the relative acting force of the coil 31 and the permanent magnet 21) of different products is compared: the maximum vibration force of the product without the iron core 32 in the coil 31 is 29.955/mN, and the maximum vibration force of the utility model is 148.05/mN. Therefore, the utility model discloses improve the vibrational force of product by a wide margin.

The foregoing are only embodiments of the present invention, which are not intended to limit the scope of the present invention, and it should be understood that modifications and substitutions can be made by those skilled in the art without departing from the inventive concept, and all such modifications and substitutions are intended to be included within the scope of the appended claims. In this case all the details may be replaced with equivalent elements, and the materials, shapes and dimensions may be any.

Claims

1. The utility model provides a linear vibration motor of nested iron core in coil, characterized in that, includes casing (1), be provided with in casing (1) active cell subassembly (2) and with active cell subassembly (2) corresponding complex stator module (3), stator module (3) include coil (31) and are used for coil (31) and external circuit are connected FPC board (33), nested iron core (32) in coil (31), active cell subassembly (2) have with corresponding complex permanent magnet (21) of coil (31).

2. A linear vibration motor with cores nested inside a coil as set forth in claim 1, wherein the cores (32) are hollow cylindrical, the permanent magnets (21) have a diameter smaller than the inner diameter of the cores (32) and one end thereof is located inside the cores (32), and the permanent magnets (21) can move along the axial direction of the cores (32) to vibrate the mover assembly (2).

3. A linear vibration motor with a nested core inside coil as claimed in claim 1, characterized in that one end of the permanent magnet (21) near the coil (31) is provided with a pole piece (24).

4. A linear vibration motor with a core nested in a coil as set forth in any one of claims 1 to 3, characterized in that said casing (1) comprises an upper casing (11) and a lower casing (12), said stator assembly (3) being provided on said lower casing (12).

5. A linear vibration motor with a nested iron core inside coil as claimed in claim 4, characterized in that the lower case (12) is provided with a third slot (123) for mounting the FPC board (33).

6. A linear vibration motor with a nested core inside a coil as set forth in claim 5, characterized in that the bottom surface of the third groove body (123) is provided with a positioning through hole (124).

7. A linear vibration motor with iron cores nested in coils as claimed in claim 4, characterized in that the mover assembly (2) is elastically connected with the upper case (11) and the lower case (12) respectively through springs (4).

8. A linear vibration motor with a nested core inside a coil as set forth in claim 7, characterized in that said lower case (12) is formed with a first flange (121) which is engaged with said spring (4) and said upper case (11).

9. A nested-in-coil core linear vibration motor as claimed in claim 7, wherein the mover assembly (2) comprises a mass (22) connected to the spring (4), and the permanent magnet (21) is disposed at an end of the mass (22) near the coil (31).

10. A linear vibration motor with a core nested in a coil as claimed in claim 9, wherein one end of the mass (22) close to the coil (31) is provided with a yoke (23) matching with the permanent magnet (21) and a first hole body (221) for placing the yoke (23), and the yoke (23) is provided with a fourth slot body (231) for placing the permanent magnet (21) with a notch facing the coil (31).